From b87f192702f5a02be473c9b05b8b34f1dc7e4296 Mon Sep 17 00:00:00 2001
From: Siddarth-Suresh <65844402+Siddarth-Suresh@users.noreply.github.com>
Date: Sun, 9 Mar 2025 11:39:59 -0400
Subject: Implement dram load

---
 tests/dram.cc | 190 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 190 insertions(+)

(limited to 'tests')

diff --git a/tests/dram.cc b/tests/dram.cc
index c646135..484b459 100644
--- a/tests/dram.cc
+++ b/tests/dram.cc
@@ -2,6 +2,7 @@
 #include "definitions.h"
 #include <array>
 #include <catch2/catch_test_macros.hpp>
+#include <iostream>
 
 TEST_CASE("Construct singleton dram", "[dram]")
 {
@@ -188,6 +189,195 @@ TEST_CASE(
 	delete d;
 }
 
+TEST_CASE("Construct singleton dram, write a line to an address, read it in zero cycles", "[dram]")
+{
+	Dram *d = new Dram(1, 0);
+	std::array<signed int, LINE_SIZE> expected = {0, 0, 0, 0};
+	std::array<signed int, LINE_SIZE> actual = d->view(0, 1)[0];
+	CHECK(expected == actual);
+
+	signed int w = 0x11223311;
+	int addr = 0x00000000;
+	for(int i=0; i<LINE_SIZE; ++i) {
+		Response r = d->write(MEM, w, addr++);
+		CHECK(r == OK);
+		expected.at(i) = w++;
+	}
+
+	Response r = d->read(MEM, 0x00000000, actual);
+	CHECK(r == OK);
+	REQUIRE(expected == actual);
+
+	r = d->read(MEM, 0x00000001, actual);
+	CHECK(r == OK);
+	REQUIRE(expected == actual);
+
+	r = d->read(MEM, 0x00000002, actual);
+	CHECK(r == OK);
+	REQUIRE(expected == actual);
+
+	r = d->read(MEM, 0x00000003, actual);
+	CHECK(r == OK);
+	REQUIRE(expected == actual);
+
+	delete d;
+}
+
+TEST_CASE("Construct singleton dram, write a line to an address in 12 cycles, read it in three cycles", "[dram]")
+{
+	int delay = 3;
+	Dram *d = new Dram(1, delay);
+	std::array<signed int, LINE_SIZE> expected = {0, 0, 0, 0};
+	std::array<signed int, LINE_SIZE> actual = d->view(0, 1)[0];
+	CHECK(expected == actual);
+
+	signed int w = 0x11223311;
+	int addr = 0x00000000;
+	int i;
+	Response r;
+	for(i=0; i<LINE_SIZE; ++i) {
+		for(int j=0; j<delay; ++j) {
+			r = d->write(MEM, w, addr);
+			d->resolve();
+		}
+		r = d->write(MEM, w, addr++);
+		d->resolve();
+		expected.at(i) = w++;
+	}
+
+	for (i = 0; i < delay; ++i) {
+		r = d->read(MEM, 0x00000000, actual);
+		CHECK(r == WAIT);
+		REQUIRE(expected != actual);
+		d->resolve();
+	}
+
+	r = d->read(MEM, 0x00000000, actual);
+	CHECK(r == OK);
+	d->resolve();
+	REQUIRE(expected == actual);
+	delete d;
+}
+
+TEST_CASE(
+	"Construct singleton dram, store line in 12 cycles, read line in 3 cycles with no conflict","[dram]")
+{
+	int delay = 3;
+	Dram *d = new Dram(1, delay);
+	std::array<signed int, LINE_SIZE> expected = {0, 0, 0, 0};
+	std::array<signed int, LINE_SIZE> actual = d->view(0, 1)[0];
+	CHECK(expected == actual);
+
+	signed int w = 0x11223311;
+	int addr = 0x00000000;
+	int i;
+	Response r;
+	for(i=0; i<LINE_SIZE; ++i) {
+		for(int j=0; j<delay; ++j) {
+			r = d->write(MEM, w, addr);
+			d->resolve();
+		}
+		r = d->write(MEM, w, addr++);
+		d->resolve();
+		expected.at(i) = w++;
+	}
+
+	for (i = 0; i < delay; ++i) {
+		r = d->read(MEM, 0x00000000, actual);
+		CHECK(r == WAIT);
+		REQUIRE(expected != actual);
+		d->resolve();
+	}
+
+	r = d->read(MEM, 0x00000000, actual);
+	REQUIRE(r == OK);
+	r = d->read(FETCH, 0x00000003, actual);
+	CHECK(r == WAIT); 
+	d->resolve();
+	REQUIRE(expected == actual);
+
+	actual = {0,0,0,0};
+	for (i = 0; i < delay; ++i) {
+		r = d->read(FETCH, 0x00000000, actual);
+		CHECK(r == WAIT);
+		REQUIRE(expected != actual);
+		d->resolve();
+	}
+
+	r = d->read(FETCH, 0x00000000, actual);
+	REQUIRE(r == OK);
+	r = d->read(MEM, 0x00000002, actual);
+	CHECK(r == WAIT);
+	d->resolve();
+	REQUIRE(expected == actual);
+	
+	delete d;
+
+}
+
+TEST_CASE(
+	"Construct singleton dram, store line in 12 cycles, read line in 3 cycles with much conflict","[dram]")
+{
+	int delay = 3;
+	Dram *d = new Dram(1, delay);
+	std::array<signed int, LINE_SIZE> expected = {0, 0, 0, 0};
+	std::array<signed int, LINE_SIZE> actual = d->view(0, 1)[0];
+	CHECK(expected == actual);
+
+	signed int w = 0x11223311;
+	int addr = 0x00000000;
+	int i;
+	Response r;
+	for(i=0; i<LINE_SIZE; ++i) {
+		for(int j=0; j<delay; ++j) {
+			r = d->write(MEM, w, addr);
+			d->resolve();
+		}
+		r = d->write(MEM, w, addr++);
+		d->resolve();
+		expected.at(i) = w++;
+	}
+
+	for (i = 0; i < delay; ++i) {
+		r = d->read(MEM, 0x00000000, actual);
+		CHECK(r == WAIT);
+		REQUIRE(expected != actual);
+		r = d->read(FETCH, 0x00000002, actual);
+		CHECK(r == WAIT);
+		REQUIRE(expected != actual);
+		d->resolve();
+	}
+
+	r = d->read(MEM, 0x00000000, actual);
+	REQUIRE(r == OK);
+	r = d->read(FETCH, 0x00000003, actual);
+	CHECK(r == WAIT); 
+	d->resolve();
+	REQUIRE(expected == actual);
+
+	actual = {0,0,0,0};
+	for (i = 0; i < delay; ++i) {
+		r = d->read(FETCH, 0x00000000, actual);
+		CHECK(r == WAIT);
+		REQUIRE(expected != actual);
+		r = d->read(MEM, 0x00000002, actual);
+		CHECK(r == WAIT);
+		REQUIRE(expected != actual);
+		d->resolve();
+	}
+
+	r = d->read(FETCH, 0x00000000, actual);
+	REQUIRE(r == OK);
+	r = d->read(MEM, 0x00000002, actual);
+	CHECK(r == WAIT);
+	d->resolve();
+	REQUIRE(expected == actual);
+	
+	delete d;
+
+}
+
+
 TEST_CASE("Sidedoor bypasses delay", "[dram]")
 {
 	int delay = 3;
-- 
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